Word of the Day: obtenebrate

What's "the word I'm thinking of"? Today, it's....

obtenebrate (verb)

To darken or place in shadow

"...thus do I return to you, dearest Ingeborg, to lay my head upon thy bosom, that thou mayst fan away the vapours which obtenebrate my soul, whilst placing thy warm hand upon my heart."
--Fredrika Bremer, The Rectory of Mora (1845)

Just before a thunderstorm on a hot August day, the wind rises and the whole world obtenebrates. I love that moment.